Case study:Brackenhurst Natural Flood Management

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Location: 53° 3' 52.89" N, 0° 58' 4.46" W

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Project overview

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Status	In progress
Project web site	http://www.therrc.co.uk/sites/default/files/projects/25_brackenhurst.pdf
Themes	Flood risk management, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Monitoring
Country	England
Main contact forename	Andy
Main contact surname	Disney
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Nottingham Trent University, Trent Rivers Trust, Southwell Flood Forum, Nottinghamshire County Council
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This project is a PhD research project being conducted at Nottingham Trent University by Josh Wells, supervised by Dr Jillian Labadz (Nottingham Trent University) and advised by Andy Disney (Environment Agency) and Professor Colin Thorne (University of Nottingham). It was developed on Nottingham Trent University's Brackenhurst Campus following a summer 2013 extreme flood event in the catchment, which affected the nearby market town of Southwell, immediately downstream (Map 1). A total of 107.6mm of rain fell within a 2-hour period and resulted in the flooding of up to 300 homes. The aim is to aims assess the extent to which Natural Flood Management (NFM) can help to reduce future fluvial flood occurrence in Southwell. A NFM scheme was developed for the Potwell Dyke catchment (Southwell, Nottinghamshire) as part of the PhD project. In summer 2016, 10 large woody debris dams were installed within the streams. In autumn 2016, a river restoration programme was implemented with the excavation of original meandering stream morphology along a reach plus the provision of some additional online storage capacity and the construction of 5 earth bunds in field corners. These interventions are designed to store and slow water while promoting ecological gains. A network of hydrological monitoring was installed to enable pre and post intervention stage (water level) and rainfall data to be compared. Around a year's worth of pre-intervention stage data have been collected at most locations, with one site being monitored for 2.5 years. The catchment for the Potwell Dyke is around 6km2. The NFM interventions by Nottingham Trent University are in 2 subcatchments: Springfield Dumble and Parklane Close Dumble. To date, an estimated 3,000m3 of storage has been created within these subcatchments. There is an intention to roll out further NFM measures on multiple land holdings within the Potwell Dyke catchment. Work is being carried out by Trent Rivers Trust to liaise with local landowners, with funding obtained from the Regional Flood and Coastal Committee.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Potwell Dyke WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2016 Works started Works completed Project completed Total cost category Total cost (k€) £100k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Environment Agency, Local levy funding, Vice-Chancellor Scholarship, Nottingham Trent University Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor establishment of woodland Planform / Channel pattern Other Runoff pathway management Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information